Article
Energy & Fuels
Hechun Wang, Binbin Wang, Chuanlei Yang, Deng Hu, Baoyin Duan, Yinyan Wang
Summary: This paper studies the dual injection strategy of a diesel ignition ammonia/hydrogen mixed fuel engine through simulation, selecting the optimal combination of dual injection timing to improve combustion and emission performance. The results show that with delayed fuel injection timing, engine power and economy decline, while HC, soot, CO, and N2O emissions increase and NOx emissions decrease. After using ammonia/hydrogen mixed fuel, ammonia and hydrogen escape are low, and the emission of HC, soot, and CO is also low. The best injection timing combination is D698/A/H698, which has the best power and economic performance. N2O emissions are low, but NOx emissions are relatively high. The research results can promote the development of ammonia fuel and provide theoretical guidance for its practical application. Evaluation: 9/10.
Article
Energy & Fuels
Zhongshu Wang, Fangyuan Zhang, Ye Xia, Dan Wang, Yun Xu, Guizhi Du
Summary: This study investigated the impact of pilot diesel injection timing on combustion phases of diesel and natural gas in a dual fuel engine, showing that injection timing plays a crucial role in determining engine thermal efficiency and exhaust emissions level. The results revealed a clear correspondence between the lengths of combustion period of two fuels, with advancing pilot diesel injection resulting in shortened combustion durations and increased combustion overlap periods.
Article
Energy & Fuels
Amin Yousefi, Hongsheng Guo, Shouvik Dev, Brian Liko, Simon Lafrance
Summary: This study investigates the feasibility of an ammonia/diesel dual-fuel engine in reducing greenhouse gas emissions while maintaining diesel-like efficiency. Results show that increasing the ammonia energy fraction reduces nitrogen oxide emissions but increases nitrous oxide emissions, resulting in higher overall greenhouse gas emissions compared to diesel-only combustion. Advancing the start of diesel injection helps reduce nitrous oxide and overall greenhouse gas emissions while achieving diesel-like thermal efficiency.
Article
Energy & Fuels
Hongliang Yu, Jiafeng Chen, Shulin Duan, Peiting Sun, Weiwei Wang, Haitao Tian
Summary: This paper investigates the impact of different natural gas injection timings on the combustion process and emissions of marine low-speed dual-fuel engines. The results show that advancing the injection timing increases power and thermal efficiency, but also increases NO emissions. The combustion process consists of stable and unstable stages, as well as a long tail heat release stage. The optimal NGIT for reducing methane and NO emissions is found to be 6 degrees CA BTDC and 4 degrees CA BTDC.
Article
Chemistry, Applied
Zhipeng Li, Junheng Liu, Qian Ji, Ping Sun, Xidong Wang, Pan Xiang
Summary: This study investigated the effects of hydrogen substitution ratio and diesel injection timing on the combustion and emission characteristics of a hydrogen-diesel dual-fuel combustion mode in an internal combustion engine. The results showed that increasing the hydrogen substitution ratio led to reduced emissions and decreased combustion pressure, while advancing the diesel injection timing resulted in more efficient combustion and increased emissions and brake thermal efficiency.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Energy & Fuels
S. Ouchikh, M. S. Lounici, K. Loubar, L. Tarabet, M. Tazerout
Summary: Experimental research on the diesel injection strategy for a methane/diesel dual-fuel engine revealed that the split injection strategy significantly improved combustion efficiency and reduced NOx emissions at low load conditions.
Article
Thermodynamics
Kailin Yang, Zhongshu Wang, Kechao Zhang, Dan Wang, Fangxi Xie, Yun Xu, Kaiqiang Yang
Summary: A detailed investigation was conducted to understand the effect of natural gas injection timing on the combustion and emissions performance of a dual-direct-injection diesel/natural gas engine. The results showed that advancing the injection timing of natural gas can achieve higher thermal efficiency.
Article
Thermodynamics
Bahram Jafari, Mahdi Seddiq, Seyyed Mostafa Mirsalim
Summary: This research shows that increasing syngas energy ratio and adjusting diesel injection timing can effectively reduce emissions and improve engine performance. However, increasing syngas ratio may also lead to higher combustion and heat transfer losses.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Engineering, Chemical
Jianbin Luo, Zhonghang Liu, Jie Wang, Heyang Chen, Zhiqing Zhang, Boying Qin, Shuwan Cui
Summary: The results show that increasing the natural gas mixing ratio decreases cylinder pressure and heat release rate, leading to a reduction in NOx emissions. Using appropriate injection strategies can improve combustion efficiency in the cylinder and alleviate the trade-off relationship between NOx and soot.
Article
Chemistry, Physical
F. Ekin, O. A. Ozsoysal, H. Arslan
Summary: Alternative fuels, such as natural gas and hydrogen, are crucial for improving performance and reducing emissions in engines. This study investigated the effects of adding hydrogen to a natural gas-diesel dual fuel engine using numerical simulations. The results showed that the addition of hydrogen in appropriate proportions improved performance and reduced emissions. However, increasing the diesel fuel injection advance and the hydrogen ratio had negative effects on engine performance and emissions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Energy & Fuels
Zhijie Zhu, Xingyu Liang, Lei Cui, Kun Wang, Xiaohui Wang, Shihao Zhu
Summary: Currently, most ships still rely on fossil fuels as the main source for marine engines. However, diesel as a fuel for marine engines is no longer sufficient to meet the economic requirements of shipping and emission restrictions imposed by regulations. This research examined the viability of employing hydrogen-carrying fuel ammonia (NH3) in marine engines to develop a low-carbon combustion technology, to address the carbon emission problem of marine diesel engines.
Article
Energy & Fuels
Wenhui Tao, Tao Sun, Wenjun Guo, Kangbo Lu, Lei Shi, He Lin
Summary: Diesel fuel pilot injection timing, pilot mass percent, and methanol substitution rate were experimentally investigated to study their effects on the combustion and emissions of a diesel-methanol dual fuel engine. The results showed that adding pilot injection advanced the ignition time and increased the heat release rate. With the increase in pilot mass percent, the peak in-cylinder pressure and heat release rate increased. Furthermore, at high methanol substitution rates, advancing the pilot injection timing, increasing the pilot mass percent, and combining exhaust gas recirculation (EGR) were found to improve combustion performance and reduce emissions.
Article
Thermodynamics
Xiyu Yang, Xiaoyan Wang, Quan Dong, Zuo Ni, Jingdong Song, Tanqing Zhou
Summary: This study presents an innovative fuel injection rate measurement methodology for studying dual-fuel injection characteristics in a high-pressure natural gas direct injection engine. The results demonstrate two different upward trends in injection mass with increasing energizing time, with greater sensitivity observed for shorter energizing times. The duration of gas injection is influenced by both injection pressure and ambient pressure, and increases in either parameter lead to significantly longer injection durations and higher gas injection mass. The pilot diesel injection process has a notable effect on the gas injection rate.
Article
Energy & Fuels
Amin Yousefi, Hongsheng Guo, Shouvik Dev, Simon Lafrance, Brian Liko
Summary: This study investigates the effect of split diesel injection strategy on an ammonia/diesel dual-fuel engine under medium load conditions. Results show that the use of split diesel injection strategy increases the thermal efficiency and reduces the unburned ammonia emissions. Two optimized split diesel injection strategies are suggested to reduce greenhouse gas emissions while improving combustion efficiency, although they result in higher nitrogen oxides emissions.
Article
Engineering, Chemical
Tiantian Yang, Dongdong Chen, Lei Liu, Longyan Zhang, Tie Wang, Guoxing Li, Haiwei Chen, Yao Chen
Summary: To reduce emissions and save energy, alternative fuel and dual-fuel mode have been widely applied in diesel engines. The effects of a diesel fuel pilot injection strategy on the performance of an ethanol/F-T diesel dual-fuel engine were experimentally investigated. The results show that pilot injection timing has a small effect on combustion characteristics parameters but tends to decrease soot, NOx, and CO emissions.
Article
Thermodynamics
Pengcheng Zhao, Jingang Wang, Liming Sun, Yun Li, Haiting Xia, Wei He
Summary: The production of green hydrogen through water electrolysis is crucial for renewable energy utilization and decarbonization. This research explores the optimal electrode configuration and system design of compactly-assembled industrial electrolyzer. The findings provide valuable insights for industrial application of water electrolysis equipment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
V. Baiju, P. Abhishek, S. Harikrishnan
Summary: Thermally driven adsorption desalination systems (ADS) have gained attention as an eco-friendly solution for water scarcity. However, they face challenges related to low water productivity and scalability. To overcome these challenges, integrating ADS with other desalination technologies can create a small-scale hybrid system. This study proposes integrating ADS with a Thermo Electric Dehumidification (TED) unit to enhance its performance.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
C. X. He, Y. H. Liu, X. Y. Huang, S. B. Wan, Q. Chen, J. Sun, T. S. Zhao
Summary: A decentralized centroid multi-path RC network model is constructed to improve the temperature prediction accuracy compared to traditional RC models. By incorporating multiple heat flow paths and decentralizing thermal capacity, a more accurate prediction is achieved.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chaoying Li, Meng Wang, Nana Li, Di Gu, Chao Yan, Dandan Yuan, Hong Jiang, Baohui Wang, Xirui Wang
Summary: There is an urgent need to shift away from heavy dependence on fossil fuels and embrace renewable energy sources, particularly in the energy-intensive oil refining process. This study presents an innovative concept called the Solar Oil Refinery, which applies solar energy in oil refining. A solar multi-energies-driven hybrid chemical oil refining system that utilizes solar pyrolysis and electrolysis has been developed, significantly improving solar utilization efficiency, cracking rate, and hydrogen yield.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chao Ma, Guanghui Wang, Dingbiao Wang, Xu Peng, Yushen Yang, Xinxin Liu, Chongrui Yang, Jiaheng Chen
Summary: This study proposes a bio-inspired fish-tail wind rotor to improve the wind power efficiency of the traditional Savonius rotor. Through transient simulations and orthogonal experiments, the key factors affecting the performance are identified. A response surface model is constructed to optimize the power coefficient, resulting in an improvement of 9.4% and 6.6% compared to the Savonius rotor.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sina Bahmanziari, Abbas-Ali Zamani
Summary: This paper proposes a new framework for improving electrical energy harvesting from piezoelectric smart tiles through a combination of magnetic plucking, mechanical impact, and mechanical vibration force mechanisms. Experimental results demonstrate a significant increase in energy yield and average energy harvesting time compared to other mechanisms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Nanjiang Dong, Tao Zhang, Rui Wang
Summary: This study establishes a multiobjective mixed-variable configuration optimization model for a comprehensive combined cooling, heating, and power energy system, and proposes an efficient generating operator to optimize this model. The experimental results show that the proposed algorithm performs better than other state-of-the-art algorithms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Ahmed E. Mansy, Eman A. El Desouky, Tarek H. Taha, M. A. Abu-Saied, Hamada El-Gendi, Ranya A. Amer, Zhen-Yu Tian
Summary: This study aims to convert office paper waste into bioethanol through a sustainable pathway. The results show that physiochemical and enzymatic hydrolysis of the waste can yield a high glucose concentration. The optimal conditions were determined using the Box-Behnken design, and a blended membrane was used for ethanol purification.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sven Klute, Marcus Budt, Mathias van Beek, Christian Doetsch
Summary: Heat pumps are crucial for decarbonizing heat supply, and steam generating heat pumps have the potential to decarbonize the industrial sector. This paper presents the current state, technical and economic data, and modeling principles of steam generating heat pumps.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Le Zhang, To-Hung Tsui, Yen Wah Tong, Pruk Aggarangsi, Ronghou Liu
Summary: This study investigates the effectiveness of a current-carrying-coil-based magnetic field in promoting anaerobic digestion of chicken manure. The results show that the applied magnetic field increases methane yield, decreases carbon dioxide production, and reduces the concentration of ammonia nitrogen. Microbial community analysis reveals the enrichment of certain methanogenic genera and enhanced metabolic pathways. Pilot-scale experiments confirm the technical effectiveness of the magnetic field assistance in enhancing anaerobic digestion of chicken manure.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Bo Chen, Ruiqing Ma, Yang Zhou, Rui Ma, Wentao Jiang, Fan Yang
Summary: This paper presents an advanced energy management strategy for fuel cell hybrid electric heavy-duty vehicles, focusing on speed planning and energy allocation. By utilizing predictive co-optimization control, this strategy ensures safe inter-vehicle distance and minimizes energy demand. Simulation results demonstrate the effectiveness of the proposed method in reducing fuel cell degradation cost and overall operation cost.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Fabio Fatigati, Roberto Cipollone
Summary: Organic Rankine Cycle-based microcogeneration systems that use solar sources to generate electricity and hot water can help reduce CO2 emissions in residential energy-intensive sectors. The adoption of a recuperative heat exchanger in these systems improves efficiency, reduces thermal power requirements, and saves on electricity costs.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Lipeng He, Renwen Liu, Xuejin Liu, Xiaotian Zheng, Limin Zhang, Jieqiong Lin
Summary: This research proposes a piezoelectric-electromagnetic hybrid energy harvester (PEHEH) for low-frequency wave motion and self-sensing wave environment monitoring. The PEHEH shows promising power output and the ability to self-power and self-sense the wave environment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Shangling Chu, Yang Liu, Zipeng Xu, Heng Zhang, Haiping Chen, Dan Gao
Summary: This paper studies a distributed energy system integrated with solar and natural gas, analyzes the impact of different parameters on its energy utilization and emissions reduction, and obtains the optimal solution through an optimization algorithm. The results show that compared to traditional separation production systems, this integrated system achieves higher energy utilization and greater reduction in carbon emissions.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Qingpu Li, Yaqi Ding, Guangming Chen, Yongmei Xuan, Neng Gao, Nian Li, Xinyue Hao
Summary: This paper proposes and studies a piston-type thermally-driven pump with a structure similar to a linear compressor, aiming to eliminate the high-quality energy consumption of existing pumps and replace mechanical pumps. The coupling mechanism of working fluid flow and element dimension is analyzed based on force analysis, and experimental data analysis is used to determine the pump operation stroke. Theoretical simulation is conducted to analyze the correlation mechanism of the piston assembly. The research shows that the thermally-driven pump can greatly reduce power consumption and has potential for industrial applications.
ENERGY CONVERSION AND MANAGEMENT
(2024)